The Butterfly:
Do these savory pies use a pie crust or are they cooked in a pie dish?
Don't know what Penel does specifically, but usually we either make our own Fyllo (crust/dough/pastry whatever you wanna call it), or buy it ready made.
There are many types of fyllo we can use, buy, or make for pies/pites, depending on the type of pie or filling, including but not limited to sfoliata (flaky puff kind made with many thin leaves and butter), kourou (the own more strongly resembling american pie dough, I think, since it's thicker), kroustas (the very very thin one that's in baklava, that the rest of the world refer to as Greek fyllo), etc.., and of course the various homemade.
There are also Greek pies made without dough, e.g. a kind of tyropita (cheese pie) they make in Ioannina.
Here in Crete, our home-made pie dough usually consists of flour, olive oil, yeast, raki/tsikoudia spirit, and sometimes full-fat traditional sheep milk yogurt and eggs. The latter is what we roll thin to use for Easter/spring savoury pies/mini pies.